Citation: ZHUANG Guo-Xin, HE Ya-Jun, MALCOLM Clark, YU Yan. Synthesis of Calcium Hexaluminate from Waste Slag of Aluminum and Oyster Shell[J]. Chinese Journal of Structural Chemistry, ;2016, 35(1): 157-165. doi: 10.14102/j.cnki.0254-5861.2011-0813 shu

Synthesis of Calcium Hexaluminate from Waste Slag of Aluminum and Oyster Shell

ZHUANG Guo-Xin ^a,b ,
HE Ya-Jun ^a,b ,
MALCOLM Clark ^c ,
YU Yan ^a,b

1.
a Key Laboratory of Eco-materials Advanced Technology Fuzhou University, Fujian Province University, China;
2.
b College of Materials Science and Engineering, Fuzhou University, New Campus, Minhou, Fuzhou 350108, China;
c Marine Ecology Research Centre, School of Environment, Science and Engineering, Southern Cross University, P.
c Marine Ecology Research Centre, School of Environment, Science and Engineering, Southern Cross University, P.O. Box 157, Lismore, NSW 2480, Australia

Received Date: 19 May 2015
Available Online: 4 November 2015
Fund Project:

Waste aluminum slag and oyster shell were used as raw materials to synthesize calcium hexaluminate (CA₆). The effects of different source materials of CaO and sintering temperature on the structures and properties of CA₆ were investigated, respectively. The results show that compared to calcium oxide, oyster shell can lower the formation temperature of CA₆, hence CA₆ can be detected at 1300 ℃ by using oyster shell as the starting raw materials. Increasing the sintering temperature can promote the crystal growth. CA₆ crystals show typical platelet shape, and its optimum sintering temperature falls in the 1450～1550 ℃ region. The bulk density is 1.54～1.83 g/cm³, the apparent porosity is 44.1～55.2% and the flexural strength is 10.8～25.3 MPa.
- waste aluminum slag,
- calcium hexaluminate,
- oyster shell powder
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